$\int\frac{x}{\left(x^2-4x\:-5\right)}dx$
$18:\left(-5+\left(-3.2+5\right)\right)$
$\frac{d}{dx}x^{-2}$
$\cos a\cdot\left(\sec^2a-1\right)=\sin^2a$
$\left(2+a\right)\left(2-a\right)-a$
$18mx-6my+54nx-18ny$
$\int8x^7\left(x^8-8\right)dx$
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